Long, Stuart A.2024-06-062024-06-06198820333316https://hdl.handle.net/10657/17524An approximate theory is derived for all the modes in a cylindrical dielectric resonator antenna. The air-dielectric interface is approximated as a perfect magnetic conductor and expressions for the resonant frequency and radiation from the equivalent surface magnetic currents are presented. A broad beam with a maximum normal to the ground plane is obtained for the lowest mode. A more directive beam or a beam with a single sharp null is obtained for the next mode depending on the cylinder geometry. Good agreement is obtained between theory and experiment. An experimental investigation was also undertaken to demonstrate the microstrip transmission line and the coplanar waveguide as effective excitation mechanisms for the cylindrical dielectric resonator antenna. Results showing the coupling behavior and the radiation patterns for various cylinder aspect ratios, dielectric constants, and feed positions are presented. The results show these feed structures result in efficient and practical antenna systems.application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Microwave antennasDielectricsThesisreformatted digital